Php method for generating fixed-length pure digital encoding

This article mainly introduces php's method of generating fixed-length pure digital encoding, involving php string and array related operation skills, which is very simple and practical, for more information, see the example in this article. Share it with you for your reference. The details are as follows:

In many cases, we need some fixed-length numbers, such as order numbers, card numbers, and user numbers! However, we often have sequential numbers stored in the database. we can convert them into a fixed-length numeric code and update them to the database to form a unique number for this record.

<? Php/*** generate a unique ID * User: minyifei.cn * Date: 15/7/7 */namespace Minyifei \ Libs based on the Date or given prefix; class SequenceNumber {/*** obtain the specified mapbit based on the display width ** @ param integer $ width number display width ** @ return array */private static function _ getMapbit ($ width) {$ mapBits = array (4 => array (10, 2, 11, 3, 0, 1, 9, 7, 12, 6, 4, 8, 5 ,), 5 => array (4, 3, 13, 15, 7, 8, 6, 2, 1, 10, 5, 12, 0, 11, 14, 9 ,), 6 => array (2, 7, 10, 9, 16, 3, 6, 8, 0, 4, 1, 12, 11, 13, 18, 5, 15, 17, 14,), 7 => array (18, 0, 2, 22, 8, 3, 1, 14, 17, 12, 4, 19, 11, 9, 13, 5, 6, 15, 10, 16, 20, 7, 21,), 8 => array (11, 8, 4, 0, 16, 14, 22, 7, 3, 5, 13, 18, 24, 25, 23, 10, 1, 12, 6, 21, 17, 2, 15, 9, 19, 20,), 9 => array (24, 23, 27, 3, 9, 16, 25, 13, 28, 12, 0, 4, 10, 18, 11, 2, 17, 1, 21, 26, 5, 15, 7, 20, 22, 14, 19, 6, 8,), 10 => array (32, 3, 1, 28, 2 1, 18, 30, 7, 12, 22, 20, 13, 16, 15, 6, 17, 9, 25, 11, 8, 4, 27, 14, 31, 5, 23, 24, 29, 0, 10, 19, 26, 2,), 11 => array (9, 13, 2, 29, 11, 32, 14, 33, 24, 8, 27, 4, 22, 20, 5, 0, 21, 25, 17, 28, 34, 6, 23, 26, 30, 3, 7, 19, 16, 15, 12, 31, 1, 35, 10, 18,), 12 => array (31, 4, 16, 33, 35, 29, 17, 37, 12, 28, 32, 22, 7, 10, 14, 26, 0, 9, 8, 3, 20, 2, 13, 5, 36, 27, 23, 15, 19, 34, 38, 11, 24, 25, 30, 21, 18, 6, 1,),); return $ mapBits [intval ($ width)];} /*** format the given timestamp ** @ param integer $ ts timestamp, if null use current timestamp ** @ return string */private static function _ fmtTS ($ ts = null) {$ ts = $ ts?: Time (); return date (self: $ _ fmt, $ ts );} /*** obtain a random and unique encoding according to the id * @ param $ id number * @ param int $ prefix * @ param int $ width length except the prefix * @ return string */ public static function generateNumber ($ id, $ prefix = 10, $ width = 8) {return sprintf ("% s", $ prefix, self: encode ($ id, $ width ));} /*** encoding conversion ** @ param integer $ id * @ param integer $ width indicates the display width of the additional component. ** @ return integer */public static function encode ($ id, $ width) {$ maximum = intval (str_repeat (9, $ width); $ superscript = intval (log ($ maximum)/log (2); $ r = 0; $ sign = 0x1 <$ superscript; $ id | = $ sign; $ mapbit = self: _ getMapbit ($ width); for ($ x = 0; $ x <$ superscript; $ x ++) {$ v = ($ id >>$ x) & 0x1; $ r | = ($ v <$ mapbit [$ x]);} $ r + = $ maximum-pow (2, $ superscript) + 1; return sprintf ("% 0 $ {width} s", $ r);}/*** obtain the unique id ** @ param integer $ id, mostly database primary key * @ param integer $ width number display width * @ param integer $ ts timestamp ** @ return string */public static function get ($ id, $ width, $ ts = null) {return sprintf ('% s % s', self: _ fmtTS ($ ts), self: encode ($ id, $ width ));}}

I hope this article will help you with php programming.